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math.FA2026
Regularity of the Sz.-Nagy and FoiaÅ Factorization of Characteristic Functions and Its Multivariable Analogue
Kalpesh J. Haria, Aashish Kumar Maurya
Given a contraction with an invariant subspace and a row contraction with a joint invariant subspace, a factorization of their characteristic functions was obtained by Sz.-Nagy and…
math.FA2026
-Regular Factorizations and Joint Invariant Subspaces of Completely Non-Coisometric Row Contractions
Kalpesh J. Haria, Aashish Kumar Maurya
This article investigates -regular factorizations of characteristic functions associated with completely non-coisometric row contractions. In this setting, a one-to-one correspo…